Thank you for viewing. This is a leather bracelet. The clasp is a surgical stainless steel (304) double ring buckle. It's a structure that tightens leather or fabric through two O-rings, and is often used for belts, bracelets, bag straps, etc. It's a type that uses friction to secure, without using holes as a fastener. Unisex (for both men and women) Size: Free (Fits wrists from 15cm to 18cm) The photo shows it worn on a wrist with a circumference of 17cm. Leather: 10mm O-rings: 21mm Materials: Genuine leather (cowhide) Clasp: Surgical stainless steel (304) Color: Leather: Brown Clasp: Silver Please feel free to ask any questions.